Finding the Third Proportional to 420.50 and 570
Calculator
Solution
The third proportional to 420.50 and 570 is: 772.65
Step by Step Solution
- Step 1: Write the proportion equation
420.50 : 570 = 570 : x - Step 2: Convert to fraction form
420.50/570 = 570/x - Step 3: Cross multiply
420.50x = 570 × 570 - Step 4: Simplify right side
420.50x = 324,900 - Step 5: Solve for x
x = 324,900/420.50 - Step 6: Final answer
x = 772.65
Related Problems
Find third proportional to 210.25 and 285
Half scale
Find third proportional to 841 and 1,140
Double scale
Find third proportional to 423 and 573
Similar ratio
Find third proportional to 630.75 and 855
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.